Ever since the first race cars were built, it's been helpful for drivers to know their engine speed. It may sound obvious, but engine power is always a function of engine speed, so accurately knowing ...

You Can Buy Rev Counters on the Cheap, but Are They Accurate? We Find Out. Every Hot Rod should have a tachometer, and if yours didn't come with one you've got a ton of options. With a Benjamin as the ...

Hello everyone! Today I’m going to discuss a cheap type of useful digital rotation per minute counter (Digital RPM Counter). The 4-Digit LED Display RPM comes with a magnetic proximity sensor switch.